why I say it is up to the designer to prevent this.
A properly designed input circuit will not be capable of operation in the undefined zone unless it has failed.
If a component fails then repair or replace as necessary.
Also determine the failure mechanism and confirm that it is not a designed in flaw.

The concept of 8 bitters is low cost optimised performance so it seems intrinsically incorrect to add a lot of circuitry to detect a possible failure thus reducing the MTBF and increasing the probability of failure.
MTBF = mean time before failure

If what you want is failure free electronics then be prepaired to spend ten to a hundred times the cost of the core electronics on insuring reliability.

I believe the guy that builds the down hole computers to monitor the firing of an atom bomb spends over $100,000 USD to insure that the computer lives long enough to collect and transmit the first burst of data. If it fails no data and nothing left to analyse. so fix that failure before the next test Mr. engineer:)
Terry